Assert the module menu lists (or does not list) a module: the proof that an account may or may not use it.
Examples
Then I should see the "Page" module
And I should see the "List" module
Then I should not see the "Extensions" module
And we should not see the "Backend Users" module
Then I should see the "Admin Tools > Settings" module
Pattern
Then(/^(I |we )*should( not)* see the "([^"]*)?" module$/, …)
Part of @webship-js/typo3-steps (github.com/webship/typo3-steps), a step pack for Webship-js 2.0.x.